This paper discusses the variational method of extrme value probelm of functional of more than one functions,changes the isoperimetric problem of functional of more than one functions to unconditional extrem value problem by using Lagrange′s method of multipliers,and gives the solution of this problem′s polar strip by using variational method.

Study on high-speed surfacing process with strip of 75 mm in width;

This paper describes the basic conditions for electric slag cladding process with Ni-base alloy strip, raises a complete set of electric slag cladding process with INCONEL 690 Ni-base alloy Strip including test plate, welding materials, standard Properties and necessary auxiliary process meadures, and analyzes the factors affecting the cladding quality.

Using a new microcomputer controlled strip overlay welder and providing suit-able welding current,voltage ,and speed, the influenee of magnetic poles position and mag-netically controlled current on the appearance of weld is investigated for the electro-slag sur-faeing and the high speed surfacing with 75 mm strip.

Theoretical analysis and experimental research on bipolar charging phenomena and electrostatic potential distribution in gas-solid fluidized beds were carried out.

Pure copper coating deposited by automatic plasma welding with melting strip electrode technology;